The correct increasing order of carbon-carbon bond lengths in benzene, ethane, ethene, acetylene and graphite is :

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acetylene < ethene < benzene < graphite < ethane

benzene < ethane < ethene < acetylene < graphite

benzene < graphite < acetylene < ethene < ethane

acetylene < ethene < graphite < benzene < ethane

answer is B.

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Detailed Solution

The length if the carbon-carbon bond depends upon the bond strength of C-H bond and bond energy.

If C-H bond is weaker it has lower bond energy and more bond length.

As a result ethane has the highest carbon-carbon bond lengths.

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